package xyz.shu.util;

import lombok.extern.slf4j.Slf4j;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.ser.impl.SimpleFilterProvider;
import org.codehaus.jackson.type.TypeReference;

import java.io.IOException;

/**
 * @author shujinhao
 */
@Slf4j
public class JsonMapper {

    private static ObjectMapper objectMapper = new ObjectMapper();

    static {
        //config ,排除为空的字段
        objectMapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);
        objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS,false);
        objectMapper.setFilters(new SimpleFilterProvider().setFailOnUnknownId(false));
        objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);
    }

    /**
     * 对象转字符串
     * @param src 对象
     * @param <T> 泛型
     * @return 返回参
     */
    public static <T> String obj2String(T src){
        if (src==null){
            return null;
        }
        try {
            return src instanceof String ? (String ) src: objectMapper.writeValueAsString(src);
        } catch (Exception e) {
           log.warn("parse object to String exception,error:{}",e);
           return null;
        }
    }

    /**
     * 字符串转对象
     * @param src 字符串
     * @param typeReference t
     * @param <T> 泛型
     * @return 返回对象
     */
    public static <T> T string2Obj(String src, TypeReference<T> typeReference){
        if (src==null || typeReference==null){
            return null;
        }
        try {
            return (T) (typeReference.getType().equals(String.class) ? src : objectMapper.readValue(src,typeReference));
        } catch (IOException e) {
            log.warn("parse String to Object exception,String:{},TypeReference<T>:{},error:{}",src,typeReference,e);
            return null;
        }
    }
}
